package com.rock.code.common.comm;

import java.security.MessageDigest;

/**
 * The type Md 5.
 *
 * @author kongqiang
 * @date 2017.03.30
 */
public class MD5 {
    /**
     * Gets md 5.
     *
     * @param s the s
     * @return the md 5
     * @author kongqiang
     * @date 2017.03.30
     */
    public final static String  getMd5(String s) {
        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9','A', 'B', 'C', 'D', 'E', 'F' };
        try {
            byte[] btInput = s.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


    public static void main(String[] args) {
        System.out.println(getMd5("qwer@1234."));
    }
}
